Update code to pass phpcs and phpstan

Problem/Motivation

phpcs reports these issues:

FILE: .../matomo_reports/web/modules/custom/matomo_reports/src/Form/ReportsForm.php
--------------------------------------------------------------------------------
FOUND 2 ERRORS AND 1 WARNING AFFECTING 3 LINES
--------------------------------------------------------------------------------
14 | WARNING | [ ] The class short comment should describe what the class
| | does and not simply repeat the class name
| | (Drupal.Commenting.ClassComment.Short)
83 | ERROR | [x] 2 spaces found before inline comment; expected "//
| | 'container-inline'," but found "// 'container-inline',"
| | (Drupal.Commenting.InlineComment.SpacingBefore)
219 | ERROR | [x] Expected newline after closing brace
| | (Drupal.ControlStructures.ControlSignature.NewlineAfterCloseBrace)
--------------------------------------------------------------------------------
PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------
FILE: ...ports/web/modules/custom/matomo_reports/src/Form/MatomoReportsSettings.php
--------------------------------------------------------------------------------
FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
--------------------------------------------------------------------------------
16 | WARNING | The class short comment should describe what the class does and
| | not simply repeat the class name
| | (Drupal.Commenting.ClassComment.Short)
--------------------------------------------------------------------------------
FILE: ...b/modules/custom/matomo_reports/src/Controller/MatomoReportsController.php
--------------------------------------------------------------------------------
FOUND 2 ERRORS AND 1 WARNING AFFECTING 3 LINES
--------------------------------------------------------------------------------
15 | WARNING | [ ] The class short comment should describe what the class does
| | and not simply repeat the class name
| | (Drupal.Commenting.ClassComment.Short)
88 | ERROR | [x] Expected newline after closing brace
| | (Drupal.ControlStructures.ControlSignature.NewlineAfterCloseBrace)
91 | ERROR | [x] Functions must not contain multiple empty lines in a row;
| | found 2 empty lines
| | (Squiz.WhiteSpace.SuperfluousWhitespace.EmptyLines)
--------------------------------------------------------------------------------
PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------
Time: 209ms; Memory: 6MB
PHP CODE SNIFFER REPORT SUMMARY
--------------------------------------------------------------------------------
FILE ERRORS WARNINGS
--------------------------------------------------------------------------------
...m/matomo_reports/src/Controller/MatomoReportsController.php 2 1
...es/custom/matomo_reports/src/Form/MatomoReportsSettings.php 0 1
.../web/modules/custom/matomo_reports/src/Form/ReportsForm.php 2 1
--------------------------------------------------------------------------------
A TOTAL OF 4 ERRORS AND 3 WARNINGS WERE FOUND IN 6 FILES
--------------------------------------------------------------------------------
PHPCBF CAN FIX 4 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------
PHP CODE SNIFFER VIOLATION SOURCE SUMMARY
---------------------------------------------------------------------------
SOURCE COUNT
---------------------------------------------------------------------------
[ ] Drupal.Commenting.ClassComment.Short 3
[x] Drupal.ControlStructures.ControlSignature.NewlineAfterCloseBrace 2
[x] Drupal.Commenting.InlineComment.SpacingBefore 1
[x] Squiz.WhiteSpace.SuperfluousWhitespace.EmptyLines 1
---------------------------------------------------------------------------
A TOTAL OF 7 SNIFF VIOLATIONS WERE FOUND IN 4 SOURCES
---------------------------------------------------------------------------
PHPCBF CAN FIX THE 3 MARKED SOURCES AUTOMATICALLY (4 VIOLATIONS IN TOTAL)
---------------------------------------------------------------------------

phpstan reports these issues:
------ -----------------------------------------------------------------
Line src/Controller/MatomoReportsController.php
------ -----------------------------------------------------------------
105 Variable $token_auth in empty() always exists and is not falsy.
------ -----------------------------------------------------------------
------ ---------------------------------------------------------------------
Line src/Form/ReportsForm.php
------ ---------------------------------------------------------------------
128 Inner named functions are not supported by PHPStan. Consider
refactoring to an anonymous function, class method, or a
top-level-defined function. See issue #165
(https://github.com/phpstan/phpstan/issues/165) for more details.
189 Call to static method filter() on an unknown class
Drupal\matomo_reports\Form\Xss.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols
190 Call to static method filter() on an unknown class
Drupal\matomo_reports\Form\Xss.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols
212 Call to static method filter() on an unknown class
Drupal\matomo_reports\Form\Xss.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols
213 Call to static method filter() on an unknown class
Drupal\matomo_reports\Form\Xss.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols
------ ---------------------------------------------------------------------
[ERROR] Found 6 errors

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes